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hammered coinage
Hammered coinage is the most common form of coins produced since the invention of coins in the first millennium BC until the early modern period of ca. the 15th–17th centuries, contrasting to the very rare cast coinage and the later developed milled coinage.
==History==
Hammered coins were produced by placing a blank piece of metal (a ''planchet'' or ''flan'') of the correct weight between two dies, and then striking the upper die with a hammer to produce the required image on both sides. The planchet was usually cast from a mold. The bottom die (sometimes called the ''anvil die'') was usually counter sunk in a log or other sturdy surface and was called a ''pile''. One of the minters held the die for the other side (called the ''trussel''), in his hand while it was struck either by himself or an assistant.
In later history, in order to increase the production of coins, hammered coins were sometimes produced from strips of metal of the correct thickness, from which the coins were subsequently cut out. Both methods of producing hammered coins meant that it was difficult to produce coins of a regular diameter. Coins were liable to suffer from "clipping" where unscrupulous people would remove slivers of precious metal since it was difficult to determine the correct diameter of the coin.
Coins were also vulnerable to "sweating," which is when silver coins would be placed in a bag that would be vigorously shaken. This would produce silver dust, which could later be removed from the bag.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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